U.S. patent application number 17/155856 was filed with the patent office on 2021-07-22 for track for traction of a vehicle.
The applicant listed for this patent is CAMSO INC.. Invention is credited to Jules Dandurand.
Application Number | 20210221453 17/155856 |
Document ID | / |
Family ID | 1000005383916 |
Filed Date | 2021-07-22 |
United States Patent
Application |
20210221453 |
Kind Code |
A1 |
Dandurand; Jules |
July 22, 2021 |
TRACK FOR TRACTION OF A VEHICLE
Abstract
A track for traction of a vehicle (e.g., a snowmobile), in which
the track is studded, i.e., comprises studs, to enhance its
traction, including to optimize acceleration, control, and/or
braking of the vehicle, such as, for example, by increasing
engagement of the studs with a ground on which the vehicle travels
(e.g., increasing their number and/or exposure) and/or improving
retention of the studs in the track (e.g., better orienting and/or
anchoring them), while being lightweight, reducing noise, and/or
withstanding high speeds.
Inventors: |
Dandurand; Jules;
(Sherbrooke, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CAMSO INC. |
Magog |
|
CA |
|
|
Family ID: |
1000005383916 |
Appl. No.: |
17/155856 |
Filed: |
January 22, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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62964470 |
Jan 22, 2020 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B62M 2027/027 20130101;
B62M 27/02 20130101; B62D 55/244 20130101; B62D 55/26 20130101 |
International
Class: |
B62D 55/26 20060101
B62D055/26; B62D 55/24 20060101 B62D055/24 |
Claims
1. A track for traction of a vehicle, the track being mountable
around a track-engaging assembly comprising a plurality of wheels,
the track being elastomeric to flex around the track-engaging
assembly, the track comprising: a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface; a plurality
of traction projections projecting from the ground-engaging outer
surface; and a plurality of studs mounted to the traction
projections and oriented transversally to a thickness-wise
direction of track.
2. The track of claim 1, wherein each traction projection of the
traction projections comprises a lower portion and an upper portion
that is configured to flex relative to the lower portion of the
traction projection when the traction projection engages the
ground.
3. The track of claim 2, wherein: a stud of the studs is mounted to
the traction projection; and the upper portion of the traction
projection is configured to flex relative to the lower portion of
the traction projection when the traction projection engages the
ground such that the stud moves towards being oriented normal to
the ground.
4. The track of claim 1, wherein each traction projection of the
traction projections comprises a top surface extending
transversally to a longitudinal direction of the track.
5. The track of claim 4, wherein the top surface of the traction
projection is inclined relative to the thickness-wise direction of
the track.
6. The track of claim 5, wherein: the traction projection comprises
a front surface and a rear surface opposite one another; and a
given one of the front surface and the rear surface of the traction
projection is inclined relative to the thickness-wise direction of
track.
7. The track of claim 1, wherein each of respective ones of the
studs is inclined relative to the thickness-wise direction of track
and a longitudinal direction of the track.
8. The track of claim 7, wherein: each of the studs comprises a tip
and a base; and, for each stud of at least a subset of the
respective ones of the studs, the tip of the stud of at least the
subset of the respective ones of the studs is offset relative to
the base of the stud of at least the subset of the respective ones
of the studs in the longitudinal direction of track such that the
tip of the stud of at least the subset of the respective ones of
the studs is positioned more forward than the base of the stud of
at least the subset of the respective ones of the studs.
9. The track of claim 8, wherein: the subset of the respective ones
of the studs is a first subset of the respective ones of the studs;
and, for each stud of a second subset of the respective ones of the
studs, the tip of the stud the second subset of the respective ones
of the studs is offset relative to the base of the stud of the
second subset of the respective ones of the studs in the
longitudinal direction of track such that the tip of the stud of
the second subset of the respective ones of the studs is positioned
more rearward than the base of the stud of the second subset of the
respective ones of the studs.
10. The track of claim 9, wherein the first subset of the
respective ones of the studs is larger in number than the second
subset of the respective ones of the studs.
11. The track of claim 10, wherein the first subset of the
respective ones of the studs is at least three fifths of the
respective ones of the studs.
12. (canceled)
13. The track of claim 10, wherein the first subset of the
respective ones of the studs is at least three quarters of the
respective ones of the studs.
14. The track of claim 1, wherein each of particular ones of the
studs is inclined relative to the thickness-wise direction of track
and a widthwise direction of the track.
15. The track of claim 14, wherein: each of the studs comprises a
tip and a base; for each stud of a first subset of the particular
ones of the studs, the tip of the stud of the first subset of the
particular ones of the studs is offset relative to the base of the
stud of the first subset of the particular ones of the studs in the
widthwise direction of track such that the tip of the stud of the
first subset of the particular ones of the studs is positioned
closer to a first lateral edge of the track than the base of the
stud of the first subset of the particular ones of the studs; and,
for each stud of a second subset of the particular ones of the
studs, the tip of the stud of the second subset of the particular
ones of the studs is offset relative to the base of the stud of the
second subset of the particular ones of the studs in the widthwise
direction of track such that the tip of the stud of the second
subset of the particular ones of the studs is positioned closer to
a second lateral edge of the track than the base of the stud of the
second subset of the particular ones of the studs.
16. The track of claim 1, wherein a first subset of the studs are
oriented in a first orientation and a second subset of the studs
are oriented in a second orientation different from the first
orientation.
17. The track of claim 16, wherein the first subset of the studs is
larger in number than the second subset of the studs.
18. The track of claim 16, wherein the first subset of the studs is
at least three fifths of the studs.
19. (canceled)
20. The track of claim 16, wherein the first subset of the studs is
at least three quarters of the studs.
21. The track of claim 1, wherein the studs are configured to
generate at least fifty scratch lines per turn of the track around
the track-engaging assembly.
22. (canceled)
23. (canceled)
24. The track of claim 1, wherein the studs are configured to
generate at least eighty scratch lines per turn of the track around
the track-engaging assembly.
25. The track of claim 1, wherein a contact patch of the track with
the ground includes at least 160 studs per square meter of the
contact patch of the track.
26. (canceled)
27. The track of claim 1, wherein a contact patch of the track with
the ground includes at least 240 studs per square meter of the
contact patch of the track.
28. The track of claim 1, wherein: the traction projections are
arranged in a plurality of rows spaced apart in and extending
transversally to a longitudinal direction of the track; and each of
plural ones of the rows of the traction projections includes more
than six of the studs.
29. The track of claim 28, wherein each of the plural ones of the
rows of the traction projections includes at least eight of the
studs.
30. The track of claim 1, wherein: the traction projections are
arranged in a plurality of rows spaced apart in and extending
transversally to a longitudinal direction of the track; and a
pattern of the studs that repeats along the track is defined over
at least six of the rows of the traction projections.
31. (canceled)
32. The track of claim 1, wherein: the traction projections are
arranged in a plurality of rows spaced apart in and extending
transversally to a longitudinal direction of the track; and a
pattern of the studs that repeats along the track is defined over
at least ten of the rows of the traction projections.
33. (canceled)
34. The track of claim 1, wherein a stud of the studs is mounted to
a traction projection of the traction projections and comprises: an
elongated body embedded within the traction projection; and an
enlarged head including a tip and exposed outside of the traction
projection.
35. The track of claim 34, wherein: the stud comprises metal and
carbide; and the enlarged head of the stud comprises a tip portion
including at least part of the carbide and an enlarged portion
larger than the tip portion and including at least part of the
metal.
36. The track of claim 1, wherein a stud of the studs is mounted to
a traction projection of the traction projections and comprises: a
ground-engaging outer member including a tip and exposed outside of
the traction projection; an enlarged base embedded within the
traction projection; an elongated body embedded within the traction
projection and extending from the ground-engaging outer member to
the enlarged base; and a plurality of flanges projecting laterally
from the elongated body.
37. The track of claim 36, wherein the flanges of the stud include
at least three flanges.
38. The track of claim 36, wherein the ground-engaging outer member
of the stud comprises an enlarged head.
39. The track of claim 38, wherein: the stud comprises metal and
carbide; and the enlarged head of the stud comprises a tip portion
including at least part of the carbide and an enlarged portion
larger than the tip portion and including at least part of the
metal.
40. The track of claim 1, wherein: a stud of the studs is mounted
to a traction projection of the traction projections and comprises
a ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a ratio of a
height of the tip of the stud above the top surface of the traction
projection over a length of the stud is at least 20%.
41. (canceled)
42. The track of claim 1, wherein: a stud of the studs is mounted
to a traction projection of the traction projections and comprises
a ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a ratio of a
height of the tip of the stud above the top surface of the traction
projection over a length of the stud is at least 30%.
43. The track of claim 1, wherein: a stud of the studs is mounted
to a traction projection of the traction projections and comprises
a ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a ratio of a
height of the tip of the stud above the top surface of the traction
projection over a height of the traction projection is at least
10%.
44. (canceled)
45. The track of claim 1, wherein: a stud of the studs is mounted
to a traction projection of the traction projections and comprises
a ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a ratio of a
height of the tip of the stud above the top surface of the traction
projection over a height of the traction projection is at least
20%.
46. The track of claim 1, wherein a stud of the studs is mounted to
a traction projection of the traction projections and comprises a
ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a height of the
tip of the stud above the top surface of the traction projection is
at least 1/16 inch.
47. (canceled)
48. The track of claim 1, wherein a stud of the studs is mounted to
a traction projection of the traction projections and comprises a
ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud; and a height of the
tip of the stud above the top surface of the traction projection is
at least 1/4 inch.
49.-53. (canceled)
54. The track of claim 1, wherein a traction projection of the
traction projections to which is mounted a stud of the studs
comprises a preformed hole to receive the stud.
55. The track of claim 54, wherein: the stud comprises an elongated
body embedded within the traction projection and an enlarged base;
and the preformed hole of the traction projection comprises a
stud-receiving passage configured to receive the elongated body of
the stud and an enlarged cavity disposed at an end of the
stud-receiving passage at a depth within the traction projection,
cross-sectionally larger than the stud-receiving passage, and
configured to receive the enlarged base of the stud.
56. The track of claim 1, wherein a traction projection of the
traction projections comprises: a stud-mounting portion to which is
mounted a stud of the studs; and a transversal portion that extends
from the stud-mounting portion of the traction projection and
transversally to a longitudinal direction of the track and that is
smaller than the stud-mounting portion of the traction projection
in the longitudinal direction of the track.
57. The track of claim 56, wherein: the stud-mounting portion of
the traction projection is a first stud-mounting portion of the
traction projection; the stud is a first stud; the traction
projection comprises a second stud-mounting portion to which is
mounted a second stud of the studs; and the transversal portion of
the traction projection extends from the first stud-mounting
portion of the traction projection to the second stud-mounting
portion of the traction projection and is smaller than the second
stud-mounting portion of the traction projection in the
longitudinal direction of the track.
58. The track of claim 57, wherein the transversal portion of the
traction projection is a first transversal portion and the traction
projection comprises: a third stud-mounting portion to which is
mounted a third stud of the studs; and a second transversal portion
that extends from the second stud-mounting portion of the traction
projection to the third stud-mounting portion of the traction
projection and is smaller than each of the second stud-mounting
portion and the third stud-mounting portion of the traction
projection in the longitudinal direction of the track.
59. The track of claim 58, wherein the traction projection
comprises: a fourth stud-mounting portion to which is mounted a
fourth stud of the studs; and a third transversal portion that
extends from the third stud-mounting portion of the traction
projection to the fourth stud-mounting portion of the traction
projection and is smaller than each of the third stud-mounting
portion and the fourth stud-mounting portion of the traction
projection in the longitudinal direction of the track.
60. The track of claim 1, wherein the studs are configured to
remain anchored in the traction projections at a speed of at least
160 km/h of the vehicle.
61. The track of claim 1, wherein the studs are configured to
remain anchored in the traction projections at a speed of at least
180 km/h of the vehicle.
62. (canceled)
63. A track for traction of a vehicle, the track being mountable
around a track-engaging assembly comprising a plurality of wheels,
the track being elastomeric to flex around the track-engaging
assembly, the track comprising: a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface; a plurality
of traction projections projecting from the ground-engaging outer
surface; and a plurality of studs mounted to the traction
projections; wherein each traction projection of the traction
projections comprises a lower portion and an upper portion that is
configured to flex relative to the lower portion of the traction
projection when the traction projection engages the ground such
that a stud of the studs that is mounted to the traction projection
moves towards being oriented normal to the ground.
64. A track for traction of a vehicle, the track being mountable
around a track-engaging assembly comprising a plurality of wheels,
the track being elastomeric to flex around the track-engaging
assembly, the track comprising: a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface; a plurality
of traction projections projecting from the ground-engaging outer
surface; and a plurality of studs mounted to the traction
projections; wherein each of respective ones of the studs is
inclined relative to a thickness-wise direction of track and a
longitudinal direction of the track.
65.-68. (canceled)
69. A track for traction of a vehicle, the track being mountable
around a track-engaging assembly comprising a plurality of wheels,
the track being elastomeric to flex around the track-engaging
assembly, the track comprising: a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface; a plurality
of traction projections projecting from the ground-engaging outer
surface; and a plurality of studs mounted to the traction
projections; wherein a stud of the studs is mounted to a traction
projection of the traction projections and comprises: an elongated
body embedded within the traction projection; and an enlarged head
including a tip and exposed outside of the traction projection.
70.-73. (canceled)
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims the benefit of U.S.
Provisional Application Ser. No. 64/964,470, filed Jan. 22, 2020,
which is hereby incorporated by reference herein.
FIELD
[0002] This disclosure relates generally to tracks for traction of
vehicles such as snowmobiles, all-terrain vehicles (ATVs), and
other off-road vehicles.
BACKGROUND
[0003] Certain vehicles may be equipped with tracks which enhance
their traction and floatation on soft, slippery and/or irregular
grounds (e.g., snow, ice, soil, mud, sand, etc.) on which they
operate.
[0004] For example, snowmobiles allow efficient travel on snowy and
in some cases icy grounds. A snowmobile comprises a track system
which engages the ground to provide traction. The track system
comprises a track-engaging assembly and a track that moves around
the track-engaging assembly and engages the ground to generate
traction. The track typically comprises an elastomeric body in
which are embedded certain reinforcements, such as transversal
stiffening rods providing transversal rigidity to the track,
longitudinal cables providing tensional strength, and/or fabric
layers. The track-engaging assembly comprises wheels and in some
cases slide rails around which the track is driven.
[0005] A snowmobile's track may face a number of challenges during
riding. For example, when riding on an icy ground, the track may
slide, thus reducing performances of the snowmobile and
compromising the safety of the driver (and passengers if there are
any) of the snowmobile.
[0006] Studded tracks exist, but they are typically heavy,
time-consuming to manufacture or modify, relatively expensive,
inefficient, and/or unable to withstand high speeds.
[0007] For these and other reasons, there is a need to improve
tracks for traction of vehicles.
SUMMARY
[0008] In accordance with various aspects of this disclosure, there
is provided a track for traction of a vehicle (e.g., a snowmobile),
in which the track is studded, i.e., comprises studs, to enhance
its traction, including to optimize acceleration, control, and/or
braking of the vehicle, such as, for example, by increasing
engagement of the studs with a ground on which the vehicle travels
(e.g., increasing their number and/or exposure) and/or improving
retention of the studs in the track (e.g., better orienting and/or
anchoring them), while being lightweight, reducing noise, and/or
withstanding high speeds.
[0009] For example, in accordance with an aspect of this
disclosure, there is provided a track for traction of a vehicle.
The track is movable around a track-engaging assembly comprising a
plurality of track-contacting wheels. The track is elastomeric to
flex around the track-engaging assembly and comprises a carcass
comprising a ground-engaging outer surface for engaging a ground
and an inner surface opposite to the ground-engaging outer surface,
a plurality of traction projections projecting from the
ground-engaging outer surface, and a plurality of studs mounted to
the traction projections and oriented transversally to a
thickness-wise direction of track.
[0010] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. Each traction projection of the traction projections
comprises a lower portion and an upper portion that is configured
to flex relative to the lower portion of the traction projection
when the traction projection engages the ground such that a stud of
the studs that is mounted to the traction projection moves towards
being oriented normal to the ground.
[0011] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. Each of respective ones of the studs is inclined
relative to a thickness-wise direction of track and a longitudinal
direction of the track.
[0012] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A first subset of the studs are oriented in a first
orientation and a second subset of the studs are oriented in a
second orientation different from the first orientation.
[0013] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections and configured to generate at least fifty scratch lines
per turn of the track around the track-engaging assembly.
[0014] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A contact patch of the track with the ground includes
at least 160 studs per square meter of the contact patch of the
track.
[0015] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. The traction projections are arranged in a plurality
of rows spaced apart in and extending transversally to a
longitudinal direction of the track. Each of plural ones of the
rows of the traction projections includes more than six of the
studs.
[0016] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A stud of the studs is mounted to a traction
projection of the traction projections and comprises: an elongated
body embedded within the traction projection. An enlarged head
including a tip and exposed outside of the traction projection.
[0017] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A stud of the studs is mounted to a traction
projection of the traction projections and comprises: a
ground-engaging outer member including a tip and exposed outside of
the traction projection; an enlarged base embedded within the
traction projection; an elongated body embedded within the traction
projection and extending from the ground-engaging outer member to
the enlarged base; and a plurality of flanges projecting laterally
from the elongated body.
[0018] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. Each stud of the studs is mounted to a traction
projection of the traction projections and comprises a
ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud. A ratio of a height of
the tip of the stud above the top surface of the traction
projection over a length of the stud is at least 20%.
[0019] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A stud of the studs is mounted to a traction
projection of the traction projections and comprises a
ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud. A ratio of a height of
the tip of the stud above the top surface of the traction
projection over a height of the traction projection is at least
10%.
[0020] In accordance with another aspect of the disclosure, there
is provided a track for traction of a vehicle. The track is movable
around a track-engaging assembly comprising a plurality of
track-contacting wheels. The track is elastomeric to flex around
the track-engaging assembly and comprises a carcass comprising a
ground-engaging outer surface for engaging a ground and an inner
surface opposite to the ground-engaging outer surface, a plurality
of traction projections projecting from the ground-engaging outer
surface, and a plurality of studs mounted to the traction
projections. A stud of the studs is mounted to a traction
projection of the traction projections and comprises a
ground-engaging outer member projecting outwardly from a top
surface of the traction projection, exposed outside of the traction
projection, and including a tip of the stud. A height of the tip of
the stud above the top surface of the traction projection is at
least 1/16 inch.
[0021] These and other aspects of this disclosure will now become
apparent to those of ordinary skill in the art upon review of the
following description of embodiments in conjunction with the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] A detailed description of embodiments is provided below, by
way of example only, with reference to the accompanying drawings,
in which:
[0023] FIG. 1 shows an example of a snowmobile comprising a track
system in accordance with an embodiment;
[0024] FIG. 2 shows a side view of the track system;
[0025] FIG. 3 shows a perspective view of a track-engaging assembly
of the track system;
[0026] FIGS. 4 to 8 respectively show a top perspective view, a
bottom perspective view, an elevation view and a plan view another
elevation view of part of a track comprising traction projections
and studs;
[0027] FIG. 9 shows a widthwise cross-sectional view of part of the
track;
[0028] FIG. 10 shows a longitudinal cross-sectional view of part of
the track;
[0029] FIG. 11 shows a configuration of the studs in the track;
[0030] FIG. 12 shows a longitudinal cross-sectional view of part of
the track without the studs;
[0031] FIGS. 13 and 14 show variants of the track;
[0032] FIGS. 15 to 18 show an example of an all-terrain vehicle
(ATV) comprising track systems in accordance with another
embodiment, instead of being equipped with ground-engaging
wheels;
[0033] FIGS. 19 and 20 show an example of a snow bike comprising a
track system in accordance with another embodiment, instead of
being equipped with a rear wheel;
[0034] It is to be expressly understood that the description and
drawings are only for the purpose of illustrating certain
embodiments and are an aid for understanding. They are not intended
to be limiting.
DETAILED DESCRIPTION OF EMBODIMENTS
[0035] FIG. 1 shows an embodiment of a vehicle 10 comprising a
track system 14 that comprises a track 21 to engage a ground on
which the vehicle 10 travels. In this embodiment, the vehicle 10 is
a snowmobile and the ground includes snow and/or ice. The
snowmobile 10 is designed for travelling on snow and in some cases
ice. The snowmobile 10 comprises a frame 11, a powertrain 12, the
track system 14, a ski system 17, a seat 18, and a user interface
20, which enables a user to ride, steer and otherwise control the
snowmobile 10.
[0036] In various embodiments, as further discussed below, the
track 21 is studded, i.e., comprises studs 50, to enhance its
traction, including to optimize acceleration, control, and/or
braking of the snowmobile 10, such as, for example, by increasing
engagement of the studs 50 with the ground (e.g., increasing their
number and/or exposure) and/or improving retention of the studs 50
in the track 21 (e.g., better orienting and/or anchoring them),
while being lightweight, reducing noise, and/or withstanding high
speeds.
[0037] The powertrain 12 is configured for generating motive power
and transmitting motive power to the track system 14 to propel the
snowmobile 10 on the ground. To that end, the powertrain 12
comprises a prime mover 15, which is a source of motive power that
comprises one or more motors (e.g., an internal combustion engine,
an electric motor, etc.). For example, in this embodiment, the
prime mover 15 comprises an internal combustion engine. In other
embodiments, the prime mover 15 may comprise another type of motor
(e.g., an electric motor) or a combination of different types of
motor (e.g., an internal combustion engine and an electric motor).
The prime mover 15 is in a driving relationship with the track
system 14. That is, the powertrain 12 transmits motive power from
the prime mover 15 to the track system 14 in order to drive (i.e.,
impart motion to) the track system 14. In some embodiments, at
least part (e.g., a motor and/or a transmission) of the prime mover
15 may be included in the track system 14 (e.g., may be disposed
within an envelope of the track 21).
[0038] The ski system 17 is turnable to allow steering of the
snowmobile 10. In this embodiment, the ski system 17 comprises a
pair of skis 191, 192 connected to the frame 11 via a
ski-supporting assembly 13.
[0039] The seat 18 accommodates the user of the snowmobile 10. In
this case, the seat 18 is a straddle seat and the snowmobile 10 is
usable by a single person such that the seat 18 accommodates only
that person driving the snowmobile 10. In other cases, the seat 18
may be another type of seat, and/or the snowmobile 10 may be usable
by two individuals, namely one person driving the snowmobile 10 and
a passenger, such that the seat 18 may accommodate both of these
individuals (e.g., behind one another) or the snowmobile 10 may
comprise an additional seat for the passenger.
[0040] The user interface 20 allows the user to interact with the
snowmobile 10 to control the snowmobile 10. More particularly, the
user interface 20 comprises an accelerator, a brake control, and a
steering device that are operated by the user to control motion of
the snowmobile 10 on the ground. In this case, the steering device
comprises handlebars, although it may comprise a steering wheel or
other type of steering element in other cases. The user interface
20 also comprises an instrument panel (e.g., a dashboard) which
provides indicators (e.g., a speedometer indicator, a tachometer
indicator, etc.) to convey information to the user.
[0041] The track system 14 is configured to engage the ground to
generate traction for the snowmobile 10. With additional reference
to FIGS. 2 and 3, the track system 14 comprises the track 21 and a
track-engaging assembly 24 for driving and guiding the track 21
around the track-engaging assembly 24. More particularly, in this
embodiment, the track-engaging assembly 24 comprises a frame 23 and
a plurality of track-contacting wheels which includes a plurality
of drive wheels 22.sub.1, 22.sub.2 and a plurality of idler wheels
that includes rear idler wheels 26.sub.1, 26.sub.2, lower roller
wheels 28.sub.1-28.sub.6, and upper roller wheels 30.sub.1,
30.sub.2. In this example, the frame 23 comprises an elongate
support 62 including sliding surfaces 77.sub.1, 77.sub.2 for
sliding on the track 21. As it is disposed between the track 21 and
the frame 11 of the snowmobile 10, the track-engaging assembly 24
can be viewed as implementing a suspension for the snowmobile 10.
The track system 14 has a longitudinal direction and a first
longitudinal end and a second longitudinal end that define a length
of the track system 14, a widthwise direction and a width that is
defined by a width W.sub.T of the track 21, and a heightwise
direction that is normal to its longitudinal direction and its
widthwise direction.
[0042] The track 21 is configured to engage the ground to provide
traction to the snowmobile 10. A length of the track 21 allows the
track 21 to be mounted around the track-engaging assembly 24. In
view of its closed configuration without ends that allows it to be
disposed and moved around the track-engaging assembly 24, the track
21 can be referred to as an "endless" track. With additional
reference to FIGS. 4 to 8, the track 21 comprises an inner side 25
for facing the track-engaging assembly 24, a ground-engaging outer
side 27 for engaging the ground, and lateral edges 88.sub.1,
88.sub.2. A top run 65 of the track 21 extends between the
longitudinal ends of the track system 14 and over the
track-engaging assembly 24 (including over the wheels 22.sub.1,
22.sub.2, 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6, 30.sub.1,
30.sub.2), and a bottom run 66 of the track 21 extends between the
longitudinal ends of the track system 14 and under the
track-engaging assembly 24 (including under the wheels 22.sub.1,
22.sub.2, 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6, 30.sub.1,
30.sub.2). The bottom run 66 of the track 21 defines an area of
contact 60 of the track 21 with the ground which generates traction
and bears a majority of a load on the track system 14, and which
will be referred to as a "contact patch" of the track 21 with the
ground. The track 21 has a longitudinal axis 85 which defines a
longitudinal direction of the track 21 (i.e., a direction generally
parallel to its longitudinal axis) and transversal directions of
the track (i.e., directions transverse to its longitudinal axis),
including a widthwise direction of the track (i.e., a lateral
direction generally perpendicular to its longitudinal axis). The
track 21 has a thickness-wise direction normal to its longitudinal
and widthwise directions.
[0043] The track 21 is elastomeric, i.e., comprises elastomeric
material 53, to be flexible around the track-engaging assembly 24.
The elastomeric material 53 of the track 21 can include any
polymeric material with suitable elasticity. In this embodiment,
the elastomeric material of the track 21 includes rubber. Various
rubber compounds may be used and, in some cases, different rubber
compounds may be present in different areas of the track 21. In
other embodiments, the elastomeric material 53 of the track 21 may
include another elastomer in addition to or instead of rubber
(e.g., polyurethane elastomer).
[0044] More particularly, the track 21 comprises an endless body 35
underlying its inner side 25 and ground-engaging outer side 27. In
view of its underlying nature, the body 35 will be referred to as a
"carcass". The carcass 35 is elastomeric in that it comprises
elastomeric material 38 which allows the carcass 35 to elastically
change in shape and thus the track 21 to flex as it is in motion
around the track-engaging assembly 24. The elastomeric material 38,
which is part of the elastomeric material 53 of the track 21, can
be any polymeric material with suitable elasticity. In this
embodiment, the elastomeric material 38 includes rubber. Various
rubber compounds may be used and, in some cases, different rubber
compounds may be present in different areas of the carcass 35. In
other embodiments, the elastomeric material 38 may include another
elastomer in addition to or instead of rubber (e.g., polyurethane
elastomer).
[0045] In this embodiment, as shown in FIG. 9, the carcass 35
comprises a plurality of reinforcements 45.sub.1-45.sub.P embedded
in its rubber 38. These reinforcements 45.sub.1-45.sub.P can take
on various forms.
[0046] For example, in this embodiment, a subset of the
reinforcements 45.sub.1-45.sub.P is a plurality of transversal
stiffening rods 36.sub.1-36.sub.N that extend transversally to the
longitudinal direction of the track 21 to provide transversal
rigidity to the track 21. More particularly, in this embodiment,
the transversal stiffening rods 36.sub.1-36.sub.N extend in the
widthwise direction of the track 21. Each of the transversal
stiffening rods 36.sub.1-36.sub.N may have various shapes and be
made of any suitably rigid material (e.g., metal, polymer or
composite material).
[0047] As another example, in this embodiment, the reinforcements
45.sub.i, 45.sub.j are reinforcing layers that are flexible in the
longitudinal direction of the track 21.
[0048] For instance, in this embodiment, the reinforcement 45.sub.i
is a layer of reinforcing cables 37.sub.1-37.sub.M that are
adjacent to one another and extend generally in the longitudinal
direction of the track 21 to enhance strength in tension of the
track 21 along its longitudinal direction. In this case, each of
the reinforcing cables 37.sub.1-37.sub.M is a cord including a
plurality of strands (e.g., textile fibers or metallic wires). In
other cases, each of the reinforcing cables 37.sub.1-37.sub.M may
be another type of cable and may be made of any material suitably
flexible longitudinally (e.g., fibers or wires of metal, plastic or
composite material). In some examples of implementation, respective
ones of the reinforcing cables 37.sub.1-37.sub.M may be constituted
by a single continuous cable length wound helically around the
track 21. In other examples of implementation, respective ones of
the transversal cables 37.sub.1-37.sub.M may be separate and
independent from one another (i.e., unconnected other than by
rubber of the track 21).
[0049] Also, in this embodiment, the reinforcement 45.sub.i is a
layer of reinforcing fabric 43. The reinforcing fabric 43 comprises
thin pliable material made usually by weaving, felting, knitting,
interlacing, or otherwise crossing natural or synthetic elongated
fabric elements, such as fibers, filaments, strands and/or others,
such that some elongated fabric elements extend transversally to
the longitudinal direction of the track 21 to have a reinforcing
effect in a transversal direction of the track 21. For instance,
the reinforcing fabric 43 may comprise a ply of reinforcing woven
fibers (e.g., nylon fibers or other synthetic fibers). For example,
the reinforcing fabric 43 may protect the transversal stiffening
rods 36.sub.1-36.sub.N, improve cohesion of the track 21, and
counter its elongation.
[0050] The carcass 35 may be molded into shape in a molding process
during which the rubber 38 is cured. For example, in this
embodiment, a mold may be used to consolidate layers of rubber
providing the rubber 38 of the carcass 35, the reinforcing cables
37.sub.1-37.sub.M and the layer of reinforcing fabric 43.
[0051] The inner side 25 of the track 21 comprises an inner surface
32 of the carcass 35 and a plurality of inner projections
34.sub.1-34.sub.D that project from the inner surface 32 and are
positioned to contact the track-engaging assembly 24 (e.g., at
least some of the wheels 22.sub.1, 22.sub.2, 26.sub.1, 26.sub.2,
28.sub.1-28.sub.6, 30.sub.1, 30.sub.2) to do at least one of
driving (i.e., imparting motion to) the track 21 and guiding the
track 21. Since each of them is used to do at least one of driving
the track 21 and guiding the track 21, the inner projections
34.sub.1-34.sub.D can be referred to as "drive/guide projections"
or "drive/guide lugs". In some cases, a drive/guide lug 34.sub.i
may interact with a given one of the drive wheels 22.sub.1,
22.sub.2 to drive the track 21, in which case the drive/guide lug
34.sub.i is a drive lug. In other cases, a drive/guide lug 34.sub.i
may interact with a given one of the idler wheels 26.sub.1,
26.sub.2, 28.sub.1-28.sub.2, 30.sub.1, 30.sub.2 and/or another part
of the track-engaging assembly 24 to guide the track 21 to maintain
proper track alignment and prevent de-tracking without being used
to drive the track 21, in which case the drive/guide lug 34.sub.i
is a guide lug. In yet other cases, a drive/guide lug 34.sub.i may
both (i) interact with a given one of the drive wheels 22.sub.1,
22.sub.3 to drive the track 21 and (ii) interact with a given one
of the idler wheels 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6,
30.sub.1, 30.sub.2 and/or another part of the track-engaging
assembly 24 to guide the track 21, in which case the drive/guide
lug 34.sub.i is both a drive lug and a guide lug. A height H.sub.i
of a drive/guide lug 34.sub.x may have any suitable value.
[0052] In this embodiment, each of the drive/guide lugs
34.sub.1-34.sub.D is an elastomeric drive/guide lug in that it
comprises elastomeric material 42. The elastomeric material 42,
which is part of the elastomeric material 53 of the track 21, can
be any polymeric material with suitable elasticity. More
particularly, in this embodiment, the elastomeric material 42
includes rubber. Various rubber compounds may be used and, in some
cases, different rubber compounds may be present in different areas
of each of the drive/guide lugs 34.sub.1-34.sub.D. In other
embodiments, the elastomeric material 42 may include another
elastomer in addition to or instead of rubber (e.g., polyurethane
elastomer).
[0053] The drive/guide lugs 34.sub.1-34.sub.D may be provided on
the inner side 25 in various ways. For example, in this embodiment,
the drive/guide lugs 34.sub.1-34.sub.D are provided on the inner
side 25 by being molded with the carcass 35.
[0054] In this embodiment, the carcass 35 has a thickness T.sub.c
which is relatively small. The thickness T.sub.c of the carcass 35
is measured from the inner surface 32 to the ground-engaging outer
surface 31 of the carcass 35 between longitudinally-adjacent ones
of the traction projections 58.sub.1-58.sub.T. For example, in some
embodiments, the thickness T.sub.c of the carcass 35 may be no more
than 0.25 inch, in some cases no more than 0.22 inch, in some cases
no more than 0.20 inch, and in some cases even less (e.g., no more
than 0.18 or 0.16 inch). The thickness T.sub.c of the carcass 35
may have any other suitable value in other embodiments.
[0055] The ground-engaging outer side 27 of the track 21 comprises
a ground-engaging outer surface 31 of the carcass 35 and a
plurality of traction projections 58.sub.1-58.sub.T that project
from the ground-engaging outer surface 31 to enhance traction on
the ground. The traction projections 58.sub.1-58.sub.T, which may
be referred to as "traction lugs" or "traction profiles", may have
any suitable shape (e.g., straight shapes, curved shapes, shapes
with straight parts and curved parts, etc.).
[0056] In this embodiment, each traction projection of the traction
projections 58.sub.1-58.sub.T, which will be denoted 58.sub.x,
comprises a lower portion 78 and an upper portion 82 that is
configured to flex relative to the lower portion 78 of the traction
projection 58.sub.x when the traction projection 58.sub.x engages
the ground. In particular, the lower portion 78 of the traction
projection 58.sub.x may include a base at which the traction
projection 58.sub.x projects from the ground-engaging outer surface
31.
[0057] The traction projection 58.sub.x may also comprise a top
surface 80 that is farthest from the ground-engaging outer surface
31 as well as a front surface 84 and a rear surface 86 opposite one
another. In this embodiment, the top surface 80 of the traction
projection 58.sub.x extends transversally to the longitudinal
direction of the track 21. More particularly, in this embodiment,
the top surface 80 of the traction projection 58.sub.x is inclined
relative to the thickness-wise direction of the track 21. That is,
the top surface 80 of the traction projection 58.sub.x is neither
orthogonal nor parallel relative to the thickness-wise direction of
the track 21. A given one of the front surface 84 and the rear
surface 86 of the traction projection 58.sub.x may also be inclined
relative to the thickness-wise direction of track 21. More
particularly, in this embodiment, each one of the front surface 84
and the rear surface 86 of the traction projection 58.sub.x is
inclined relative to the thickness-wise direction of track 21.
[0058] Each of the traction projections 58.sub.1-58.sub.T may have
a height H.sub.p in the heightwise direction of the track 21, a
dimension L.sub.p in the widthwise direction of the track 21, and a
dimension W.sub.p in the longitudinal direction of the track 21. In
this embodiment, each of the traction projections 58.sub.1-58.sub.T
has a longitudinal axis 75 such that it is elongated and its
dimension L.sub.p in the widthwise direction of the track 21 is a
length of that traction projection and its dimension W.sub.p in the
longitudinal direction of the track 21 is a width of that traction
projection. In this example, the longitudinal axis 75 of each of
the traction projections 58.sub.1-58.sub.T extends transversally to
the longitudinal direction of the track 21. More particularly, in
this case, the longitudinal axis 75 of each of the traction
projections 58.sub.1-58.sub.T extends in the widthwise direction of
the track 21.
[0059] In this embodiment, the ground-engaging outer side 27 of the
track 21 comprises a plurality of traction rows 83.sub.1-83.sub.N
(which may sometimes be referred to as "traction profiles") that
include respective ones of the traction projections
58.sub.1-58.sub.T and that are spaced from one another in the
longitudinal direction of the track 21. Each of the traction rows
83.sub.1-83.sub.N includes one or more of the traction projections
58.sub.1-58.sub.T and extends transversally to the longitudinal
direction of the track 21. In this example, each of the traction
rows 83.sub.1-83.sub.N is oriented to the widthwise direction of
the track 21. Also, in this example, adjacent ones of the traction
rows 83.sub.1-83.sub.N are spaced from one another at a spacing
(i.e., pitch) in the longitudinal direction of the track 21 and by
traction-projection-free areas 89.sub.1-89.sub.F (i.e., areas free
of traction projections) of the ground-engaging outer side 27 of
the track 21. Furthermore, in this example, a given one of the
traction rows 83.sub.1-83.sub.N may comprise plural ones of the
traction projections 58.sub.1-58.sub.T and one or more voids
between adjacent ones of its traction projections.
[0060] Each of the traction projections 58.sub.1-58.sub.T is an
elastomeric traction projection in that it comprises elastomeric
material 41. The elastomeric material 41, which is part of the
elastomeric material 53 of the track 21, can be any polymeric
material with suitable elasticity. More particularly, in this
embodiment, the elastomeric material 41 includes rubber. Various
rubber compounds may be used and, in some cases, different rubber
compounds may be present in different areas of each of the traction
projections 58.sub.1-58.sub.T. In other embodiments, the
elastomeric material 41 may include another elastomer in addition
to or instead of rubber (e.g., polyurethane elastomer).
[0061] The traction projections 58.sub.1-58.sub.T may be provided
on the ground-engaging outer side 27 in various ways. For example,
in this embodiment, the traction projections 58.sub.1-58.sub.T are
provided on the ground-engaging outer side 27 by being molded with
the carcass 35.
[0062] In this embodiment, as shown in FIG. 10, the track 21
comprises studs 50 to enhance its traction, including to optimize
acceleration, control, and/or braking of the snowmobile 10.
[0063] In particular, in this embodiment, at least some of (i.e.,
some of, a majority of or an entirety of) the studs 50 may be
mounted to respective ones of the traction projections
58.sub.1-58.sub.T and oriented transversally to the thickness-wise
direction of track 21. That is, a given one of the studs 50 may be
oriented transversally to the thickness-wise direction of the track
21 in that a longitudinal axis 55 of the given one of the studs 50
extends transversally to the thickness-wise direction of track 21.
More specifically, in this embodiment, at least a majority of
(i.e., a majority of or an entirety of) the studs 50 are mounted to
respective traction projections 58.sub.1-58.sub.T and oriented
transversally to the thickness-wise direction of track 21. More
particularly, in this embodiment, each stud 50 is mounted to a
given one of the traction projections 58.sub.158.sub.T and oriented
transversally to the thickness-wise direction of track 21. More
specifically, in this embodiment, each stud 50 is inclined relative
to the thickness-wise direction of the track 21 and relative to the
longitudinal direction of the track 21 in that the stud 50
comprises a tip 92 and a base 52 that is longitudinally offset
(i.e., offset in the longitudinal direction of the track 21)
relative to its tip 92.
[0064] In this example, each stud 50 comprises a ground-engaging
outer member 56 exposed outside of the traction projection
58.sub.x, the base 52 embedded within the traction projection
58.sub.x, an elongated body 54 (e.g., a shank) embedded within the
traction projection 58.sub.x and extending from the ground-engaging
outer member 56 to the base 52, and a plurality of flanges 57
projecting laterally from the elongated body 54.
[0065] In this embodiment, the base 52 is an enlarged base, i.e.,
the base 52 of the stud 50 may be enlarged in that a cross-section
of the base 52 of the stud 50 normal to the longitudinal 55 of the
stud 50 is larger than a cross-section of the elongated body 54 of
the stud 50 normal to the longitudinal axis 55 of the stud 50.
[0066] Also, in this embodiment, the ground-engaging outer member
56 of the stud 50 comprises a head 90 of the stud 50. In this case,
the head 90 is an enlarged head, i.e., the head 90 of the stud 50
may be enlarged in that a cross-section of the head 90 of the stud
50 normal to the longitudinal axis 55 of the stud 50 is larger than
a cross-section of the elongated body 54 of the stud 50 normal to
the longitudinal axis 55 of the stud 50. In this embodiment, the
enlarged head 90 is exposed outside of the traction projection
58.sub.x and includes the tip 92 of the stud 50 and an enlarged
portion 94 larger than the tip 92.
[0067] In this case, the flanges 57 of the stud 50 may include at
least three flanges. In other cases, the stud 50 may include no
flange or any other number of flanges (e.g., one, two, or more than
three flanges) like the flanges 57.
[0068] In this embodiment, as shown in FIG. 11, the configuration,
the geometry and/or the material composition of the studs 50 may
vary.
[0069] For instance, in this embodiment, the studs 50 may comprise
subsets 64.sub.1, 64.sub.2 of studs, each subset comprising at
least some of the studs 50 having similar configurations, similar
geometries and/or similar material compositions. For example, each
stud 50 of a first one of the subsets 64.sub.1, 64.sub.2 of the
studs 50 may be oriented in a first orientation and each stud 50 of
a second one of the subsets 64.sub.1, 64.sub.2 of the studs 50 may
be oriented in a second orientation different from the first
orientation.
[0070] In particular, in this embodiment, the subset 64.sub.1 of
studs 50 may be mounted to respective traction projections
58.sub.1-58.sub.T in a configuration such that when the vehicle 10
moves forward and the upper portions 82 of the respective traction
projections 58.sub.1-58.sub.T flex relative to the bases 78 of the
respective traction projections 58.sub.1-58.sub.T as the respective
traction projections 58.sub.1-58.sub.T engage the ground, the
subset 64.sub.1 of studs 50 move towards being oriented normal to
the ground. In a similar but opposite fashion, a subset 64.sub.2 of
studs 50 may be mounted to respective traction projections
58.sub.1-58.sub.T in a configuration such that when the vehicle 10
moves backwards and the upper portions 82 of the respective
traction projections 58.sub.1-58.sub.T flex relative to the bases
78 of the respective traction projections 58.sub.1-58.sub.T as the
respective traction projections 58.sub.1-58.sub.T engage the
ground, the subset 64.sub.2 of studs 50 move towards being oriented
normal to the ground.
[0071] In this embodiment, each stud 50 of the subset 64.sub.1 of
studs 50 may be inclined relative to the thickness-wise direction
of track 21 and relative to the longitudinal direction of the track
in that its tip 92 is longitudinally offset relative to its base 52
in the longitudinal direction of track 21 such that when the stud
50 is located on the bottom run 66 of the track 21, its tip 92 is
positioned more rearward (i.e., towards a rear of the vehicle 10)
than its base 92, and such that the longitudinal axis 55 of the
stud 50 is angled relative to the heightwise direction of the track
21. An angle a between the longitudinal axis 55 of each stud 50 of
the subset 64.sub.1 and the heightwise direction of the track 21
may have any suitable value. For instance, in some embodiments, the
angle a may be at least 5.degree., in some embodiments at least
10.degree., in some embodiments at least 13.degree., in some
embodiments at least 15.degree., and in some embodiments even more
(e.g., at least 17.degree.).
[0072] Further, in this embodiment, each stud 50 of the subset
64.sub.2 of studs 50 may have its tip 92 longitudinally offset
relative to its base 52 in the longitudinal direction of track 21
such that when the stud 50 is located on the bottom run 66 of the
track 21, its tip 92 is positioned more forward (i.e., towards a
front of the vehicle 10) than its base 92 and such that the
longitudinal axis 55 of the stud 50 is angled relative to the
heightwise direction of the track 21 by an angle that is, in some
embodiments, at least 2.degree., in some embodiments at least
5.degree., in some embodiments at least 10.degree., in some
embodiments at least 13.degree., in some embodiments at least
15.degree., and in some embodiments even more (e.g., at least
17.degree.).
[0073] Each one of the subsets 64.sub.1, 64.sub.2 of studs 50 may
represent any suitable proportion of the studs 50. For example, the
subset 64.sub.1 of studs 50 and the subset 64.sub.2 of studs 50 may
differ in number. Specifically, in this embodiment, the subset
64.sub.1 of studs 50 is larger in number than the subset 64.sub.2
of studs 50. For example, in some embodiments, the subset 64.sub.1
of studs 50 may represent in number at least three fifths, in some
embodiments at least two thirds, in some embodiments at least three
quarters, in some embodiments even more (e.g., at least ) of a
total amount of studs 50. Also, in some embodiments a ratio of the
number of studs 50 in the subset 64.sub.1 over the number of studs
50 in the subset 64.sub.2 may be at least 1.5, in some embodiments
at least 2, in some embodiments at least 3 and in some embodiments
even more (e.g., at least 4).
[0074] The track 10 may be configured to generate a number of
scratch lines that may be high even though the width W.sub.T of the
track 21 is limited. The number of scratch lines refers to the
number of marks laterally spaced in the lateral direction of the
track 21 left by the studs 50 on the ground when the track 24 turns
around the track-engaging assembly 24. Without being bound by
theory, it has been found that increasing the number of scratch
lines increases performances (e.g., traction on ice) of the track
21. For example, in some embodiments, the studs 50 are configured
to generate at least fifty, in some embodiments at least sixty, in
some embodiments at least seventy, in some embodiments at least
eighty, in some embodiments even more (e.g., ninety) scratch lines
per turn of the track 21 around the track-engaging assembly 24.
[0075] This may be achieved by having a relatively high number of
studs 50 per surface unit of the contact patch of the track 21. For
example, in some embodiments, the contact patch of the track 21
with the ground includes at least 160 studs 50 per square meter, in
some embodiments at least 200 studs 50 per square meter, in some
embodiments at least 220 studs 50 per square meter, in some
embodiments at least 240 studs 50 per square meter, in some
embodiments even more studs 50 per square meter of the contact
patch of the track 21.
[0076] This may also be achieved by disposing the studs 50
strategically. For example, in some embodiments, each of plural
ones of the rows 83.sub.1-83.sub.N of the traction projections
58.sub.1-58.sub.T includes at least six, in some embodiments at
least eight, and in some embodiments even more (e.g., at least
nine) of the studs 50. As another example, the studs 50 may be
arranged in a pattern 95 that spans a relatively high number of the
rows 83.sub.1-83.sub.N of the traction projections
58.sub.1-58.sub.T (i.e., the disposition of the studs 50 in each
one of the rows 83.sub.1-83.sub.N spanned by the pattern 95 is
different from the dispositions of the studs 50 of the other ones
of the rows 83.sub.1-83.sub.N spanned by the pattern 95) and
repeats along the track 21. For example, in some embodiment, the
pattern 95 of the studs 50 is defined over at least six, in some
embodiments at least eight, in some embodiments at least ten, in
some embodiments at least twelve, in some embodiments even more
(e.g., at least fourteen) of the rows 83.sub.1-83.sub.N of the
traction projections 58.sub.1-58.sub.T.
[0077] A height H.sub.S of the tip 92 of a stud 50 above the top
surface 80 of a traction projection 58.sub.x in which the stud 50
is mounted may be relatively high in order to improve performances
(e.g., traction on ice) of the track 21. For example, in some
embodiments, a ratio of the height H.sub.S of the tip 92 of the
stud 50 above the top surface 80 of the traction projection
58.sub.1-58.sub.T over a length L.sub.S of the stud 50 is at least
20%, in some embodiments at least 25%, in some embodiments at least
30%, and in some embodiments even more (e.g., at least 35%). As
another example, in some embodiments, a ratio of the height Hs of
the tip 92 of the stud 50 above the top surface 80 of the traction
projection 58.sub.1-58.sub.T over the height HP of the traction
projection 58.sub.1-58.sub.T is at least 10%, in some embodiments
at least 15%, in some embodiments at least 20%, and in some
embodiments even more (e.g., at least 25%). As another example, in
some embodiments, the height Hs of the tip 92 of the stud 50 above
the top surface 80 of the traction projection 58.sub.1-58.sub.T may
be at least 1/16 inch, in some embodiments at least 1/8 inch, in
some embodiments at least 1/4 inch, and in some embodiments even
more (e.g., at least 3/8 inch).
[0078] The studs 50 may comprise any suitable material. For
instance, in this embodiment, the studs 50 may comprise a metal and
a carbide. In this embodiment, the tip 92 of the enlarged head 90
of each stud 50 comprises a material 96 and the enlarged portion 94
of the enlarged head 90 of each stud 50 comprises a material 98.
Specifically, in this embodiment, the material 96 of the tip 92 of
each stud 50 may comprise at least part of the carbide of the stud
50 and the material 98 of the enlarged portion 94 of each stud 50
may comprise at least part of the metal of the stud 50
[0079] In this embodiment, the traction projections
58.sub.1-58.sub.T may comprise stud-mounting portions 102 to which
are mounted the studs 50, and transversal portions 104 that extend
from the stud-mounting portions 102 of the projections
58.sub.1-58.sub.T and transversally to the longitudinal direction
of the track 21. In particular, each stud-mounting portion 102 of
the traction projections 58.sub.1-58.sub.T may be configured to
receive at least one stud 50, and the transversal portions 104 may
be smaller in the longitudinal direction of the track than the
stud-mounting portions 102 from which they extend. Each traction
projection 58.sub.x may comprise any suitable number (e.g., one,
two, three, four, five, six, seven, eight or more) of stud-mounting
portions 102 and at least some transversal portions 104 of the
traction projection 58.sub.x may connect different stud-mounting
portions 102 to one another (e.g., may extend from one of the
stud-mounting portions 102 to another one of the stud-mounting
portions 102). Each stud-mounting portion 102 may also be
configured to receive any suitable number of (e.g., one, two, three
or more than three) studs 50. For example, in this embodiment, each
stud-mounting portion 102 of the traction projections
58.sub.1-58.sub.T is configured to receive one stud 50, each
projection 58.sub.x comprises as many stud-mounting portions 102 as
the number of studs it is configured to receive, and at least "n-1"
transversal portions 104 (n representing the number of
stud-mounting portions 102 of the traction projection
58.sub.x).
[0080] As shown in FIG. 12, in this embodiment, in order to
position the studs 50 in the traction projections 58.sub.1-58.sub.T
in an efficient and precise manner, the stud-mounting portions 102
of the traction projections 58.sub.1-58.sub.T may comprise
preformed holes 68 to receive the studs 50. This may allow the
track 21 to have improved performances, such as by reducing noise,
increasing standardization of the track 21, increasing durability
of the track 21, allowing higher speed of the vehicle 10 before
collapsing, etc. The preformed holes 68 of the projections
58.sub.1-58.sub.T each comprise a stud-receiving passage 70
configured to receive the elongated body 54 of the respective stud
50 and an enlarged cavity 72 disposed at an end 74 of the
stud-receiving passage 70 at a depth DH within the respective
traction projection 58.sub.x, cross-sectionally larger than the
stud-receiving passage 70, and configured to receive the enlarged
base 52 of the respective stud 50.
[0081] The configuration of the studs 50 may allow the studs 50 to
remain anchored in the traction projections 58.sub.1-58.sub.T at a
relatively high speed of the vehicle 10. For instance, in some
embodiments, the studs 50 may allow the studs 50 to remain anchored
in the traction projections 58.sub.1-58.sub.T at a speed of the
vehicle 10 of at least 160 km/h, in some embodiments of at least
180 km/h, in some embodiments of at least 190 km/h, and in some
embodiments even more (e.g., at least 200 km/h).
[0082] In this example, the track 21 comprises windows (i.e.,
openings) 40.sub.1-40.sub.H extending therethrough. The track 21
may comprise slide members 39.sub.1-39.sub.S, which can sometimes
be referred to as "clips", to slide against the sliding surfaces
77.sub.1, 77.sub.2 of the track-engaging assembly 24 to reduce
friction and may be mounted via the windows 40.sub.1-40.sub.H. In
this case, the track 21 comprises window rows 41.sub.1, 41.sub.2
that include respective ones of the windows 40.sub.1-40.sub.H and
are spaced apart from one another in the widthwise direction of the
track 21.
[0083] The track-engaging assembly 24 is configured to drive and
guide the track 21 around the track-engaging assembly 24.
[0084] Each of the drive wheels 22.sub.1, 22.sub.2 is rotatable by
an axle for driving the track 21. That is, power generated by the
prime mover 15 and delivered over the powertrain 12 of the
snowmobile 10 rotates the axle, which rotates the drive wheels
22.sub.1, 22.sub.2, which impart motion of the track 21. In this
embodiment, each drive wheel 22.sub.i comprises a drive sprocket
engaging some of the drive/guide lugs 34.sub.1-34.sub.D of the
inner side 25 of the track 21 in order to drive the track 21. In
other embodiments, the drive wheel 22.sub.i may be configured in
various other ways. For example, in embodiments where the track 21
comprises drive holes, the drive wheel 22.sub.i may have teeth that
enter these holes in order to drive the track 21. As yet another
example, in some embodiments, the drive wheel 22.sub.i may
frictionally engage the inner side 25 of the track 21 in order to
frictionally drive the track 21. The drive wheels 22.sub.1,
22.sub.2 may be arranged in other configurations and/or the track
system 14 may comprise more or less drive wheels (e.g., a single
drive wheel, more than two drive wheels, etc.) in other
embodiments.
[0085] The idler wheels 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6,
30.sub.1, 30.sub.2 are not driven by power supplied by the prime
mover 15, but are rather used to do at least one of guiding the
track 21 as it is driven by the drive wheels 22.sub.1, 22.sub.2,
tensioning the track 21, and supporting part of the weight of the
snowmobile 10 on the ground via the track 21. More particularly, in
this embodiment, the rear idler wheels 26.sub.1, 26.sub.2 are
trailing idler wheels that maintain the track 21 in tension, guide
the track 21 as it wraps around them, and can help to support part
of the weight of the snowmobile 10 on the ground via the track 21.
The lower roller wheels 28.sub.1-28.sub.6 roll on the inner side 25
of the track 21 along the bottom run 66 of the track 21 to apply
the bottom run 66 on the ground. The upper roller wheels 30.sub.1,
30.sub.2 roll on the inner side 25 of the track 21 along the top
run 65 of the track 21 to support and guide the top run 65 as the
track 21 moves. The idler wheels 26.sub.1, 26.sub.2,
28.sub.1-28.sub.6, 30.sub.1, 30.sub.2 may be arranged in other
configurations and/or the track assembly 14 may comprise more or
less idler wheels in other embodiments.
[0086] The frame 23 of the track system 14 supports various
components of the track-engaging assembly 24, including, in this
embodiment, the idler wheels 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6,
30.sub.1, 30.sub.2. More particularly, in this embodiment, the
frame 23 comprises an elongate support 62 extending in the
longitudinal direction of the track system 14 along the bottom run
66 of the track 21 and frame members 49.sub.1-49.sub.F extending
upwardly from the elongate support 62.
[0087] The elongate support 62 comprises rails 44.sub.1, 44.sub.2
extending in the longitudinal direction of the track system 14
along the bottom run 66 of the track 21. In this example, the idler
wheels 26.sub.1, 26.sub.2, 28.sub.1-28.sub.6 are mounted to the
rails 44.sub.1, 44.sub.2. In this embodiment, the elongate support
62 comprises the sliding surfaces 77.sub.1, 77.sub.2 for sliding on
the inner side 25 of the track 21 along the bottom run 66 of the
track 21. Thus, in this embodiment, the idler wheels 26.sub.1,
26.sub.2, 28.sub.1-28.sub.6 and the sliding surfaces 77.sub.1,
77.sub.2 of the elongate support 62 can contact the bottom run 66
of the track 21 to guide the track 21 and apply it onto the ground
for traction. In this example, the sliding surfaces 77.sub.1,
77.sub.2 can slide against the inner surface 32 of the carcass 35
and can contact respective ones of the drive/guide lugs
34.sub.1-34.sub.D to guide the track 21 in motion. Also, in this
example, the sliding surfaces 77.sub.1, 77.sub.2 are curved
upwardly in a front region of the track system 14 to guide the
track 21 towards the drive wheels 22.sub.1, 22.sub.2.
[0088] In this embodiment, the elongate support 62 comprises
sliders 33.sub.1, 33.sub.2 mounted to respective ones of the rails
44.sub.1, 44.sub.2 and comprising respective ones of the sliding
surfaces 77.sub.1, 77.sub.2. In this embodiment, the sliders
33.sub.1, 33.sub.2 are mechanically interlocked with the rails
44.sub.1, 44.sub.2. In other embodiments, instead of or in addition
to being mechanically interlocked with the rails 44.sub.1,
44.sub.2, the sliders 33.sub.1, 33.sub.2 may be fastened to the
rails 44.sub.1, 44.sub.2. For example, in some embodiments, the
sliders 33.sub.1, 33.sub.2 may be fastened to the rails 44.sub.1,
44.sub.2 by one or more mechanical fasteners (e.g., bolts, screws,
etc.), by an adhesive, and/or by any other suitable fastener.
[0089] In some examples, each slider 33.sub.i may comprise a
low-friction material which may reduce friction between its sliding
surface 77.sub.i and the inner side 25 of the track 21. For
instance, the slider 33.sub.i may comprise a polymeric material
having a low coefficient of friction with the rubber of the track
21. For example, in some embodiments, the slider 33.sub.i may
comprise a thermoplastic material (e.g., a Hifax.RTM.
polypropylene). The slider 33.sub.i may comprise any other suitable
material in other embodiments. For instance, in some embodiments,
the sliding surface 77.sub.i of the slider 33.sub.i may comprise a
coating (e.g., a polytetrafluoroethylene (PTFE) coating) that
reduces friction between it and the inner side 25 of the track 21,
while a remainder of the slider 33.sub.i may comprise any suitable
material (e.g., a metallic material, another polymeric material,
etc.).
[0090] While in embodiments considered above the sliding surface
77.sub.i is part of the slider 33.sub.i which is separate from and
mounted to each rail 44.sub.i, in other embodiments, the sliding
surface 77.sub.i may be part of the rail 44.sub.i. That is, the
sliding surface 77.sub.i may be integrally formed (e.g., molded,
cast, or machined) as part of the rail 44.sub.i.
[0091] The frame members 49.sub.1-49.sub.F extend upwardly from the
elongate support 62 to hold the upper roller wheels 30.sub.1,
30.sub.2 such that the upper roller wheels 30.sub.1, 30.sub.2 roll
on the inner side 25 of the track 21 along the top run 65 of the
track 21.
[0092] The track system 14, including the track 21, may be
implemented in any other suitable way in other embodiments.
[0093] For example, in a variant, the ground-engaging outer member
56 of the stud 50 may not have any enlarged head, i.e., it may not
be larger than the elongated body 54 of the stud 50.
[0094] As another example, in a variant, at least some of (i.e.,
some of, a majority of, or an entirety of) the studs 50 of the
track 21 may be parallel to the thickness-wise direction of the
track 21.
[0095] As another example, in a variant, every stud 50 of the track
21 may have a similar configuration, a similar geometry and a
similar material composition.
[0096] As another example, in a variant, as shown in FIG. 13, at
least some of (i.e., some of, a majority of, or an entirety of) the
studs 50 of the track 21 may be inclined relative to the widthwise
direction of the track 21 in that the tip 92 of each stud 50 is
laterally offset (i.e., offset in a lateral direction) relative to
its respective base 52 in the widthwise direction of track 21, in
addition to being inclined relative to the thickness-wise direction
of the track 21 and relative to the longitudinal direction of the
track 21. More specifically, in this embodiment, each stud 50 is
inclined relative to the thickness-wise direction of the track 21,
relative to the longitudinal direction of the track 21, and
relative to the widthwise direction of track 21. In this
embodiment, the studs 50 may comprise subsets 64.sub.1, 64.sub.2,
64.sub.3, 64.sub.4, wherein: each stud 50 of the subset 64.sub.1 is
inclined such that when the stud 50 is located on the bottom run 66
of the track 21, the respective tip 92 is positioned more rearward
and closer to the lateral edge 88.sub.1 of the track 21 than the
respective base 92; each stud 50 of the subset 64.sub.2 is inclined
such that when the stud 50 is located on the bottom run 66 of the
track 21, the respective tip 92 is positioned more rearward and
closer to the lateral edge 88.sub.2 of the track 21 than the
respective base 92; each stud 50 of the subset 643 is inclined such
that when the stud 50 is located on the bottom run 66 of the track
21, the respective tip 92 is positioned more forward and closer to
the lateral edge 88.sub.1 of the track 21 than the respective base
92; and each stud 50 of the subset 64.sub.4 is inclined such that
when the stud 50 is located on the bottom run 66 of the track 21,
the respective tip 92 is positioned more forward and closer to the
lateral edge 88.sub.2 of the track 21 than the respective base
92.
[0097] As another example, in a variant, as shown in FIG. 14, some
but not all the studs 50 are inclined relative to the widthwise
direction of the track 21, such that the studs 50 may comprise
subsets 64.sub.1, 64.sub.2, 64.sub.3, 64.sub.4, 64.sub.5, 64.sub.6,
wherein: each stud 50 of the subset 64.sub.1 is not inclined
relative to the widthwise direction of the track 21 and is inclined
such that when the stud 50 is located on the bottom run 66 of the
track 21, the respective tip 92 is positioned more rearward than
the respective base 92; each stud 50 of the subset 64.sub.2 is not
inclined relative to the widthwise direction of the track 21 and is
inclined such that when the stud 50 is located on the bottom run 66
of the track 21, the respective tip 92 is positioned more forward
than the respective base 92; each stud 50 of the subset 64.sub.3 is
inclined such that when the stud 50 is located on the bottom run 66
of the track 21, the respective tip 92 is positioned more rearward
and closer to the lateral edge 88.sub.1 of the track 21 than the
respective base 92; each stud 50 of the subset 64.sub.4 is inclined
such that when the stud 50 is located on the bottom run 66 of the
track 21, the respective tip 92 is positioned more rearward and
closer to the lateral edge 88.sub.2 of the track 21 than the
respective base 92; each stud 50 of the subset 64.sub.5 is inclined
such that when the stud 50 is located on the bottom run 66 of the
track 21, the respective tip 92 is positioned more forward and
closer to the lateral edge 88.sub.1 of the track 21 than the
respective base 92; and each stud 50 of the subset 64.sub.6 is
inclined such that when the stud 50 is located on the bottom run 66
of the track 21, the respective tip 92 is positioned more forward
and closer to the lateral edge 88.sub.2 of the track 21 than the
respective base 92.
[0098] In some embodiments, certain parts of the track 21,
including the studs 50, may be implemented as described in U.S.
Patent Application Publication 2005/0168068, which is incorporated
by reference herein.
[0099] While in embodiments considered above the track system 14 is
part of the snowmobile 10, a track system including a track
constructed according to principles discussed herein may be used as
part of other off-road vehicles in other embodiments.
[0100] For example, in some embodiments, as shown in FIG. 19, a
snow bike 310 comprises a frame 311, a powertrain 312, a ski system
317, a track system 314 including a track 321, a seat 318, and a
user interface 320 which enables a user to ride, steer and
otherwise control the snow bike 310, and the track 321 may be
constructed according to principle discussed herein in respect of
the track 21.
[0101] In this embodiment, as shown in FIG. 20, the snow bike 310
is a motorcycle equipped with the ski system 317 mounted in place
of a front wheel 302 of the motorcycle 310 and the track system 314
mounted in place of a rear wheel 304 of the motorcycle 310. In this
example, the track system 314 also replaces a rear suspension unit
(e.g., a shock absorber and a swing arm) of the motorcycle.
Basically, in this embodiment, the ski system 317 and the track
system 314 are part of a conversion system 313 that converts the
motorcycle into a skied and tracked vehicle for travelling on
snow.
[0102] The powertrain 312 is configured for generating motive power
and transmitting motive power to the track system 314 to propel the
snow bike 310 on the ground. To that end, the powertrain 312
comprises a prime mover 315, which is a source of motive power that
comprises one or more motors (e.g., an internal combustion engine,
an electric motor, etc.). For example, in this embodiment, the
prime mover 315 comprises an internal combustion engine. In other
embodiments, the prime mover 315 may comprise another type of motor
(e.g., an electric motor) or a combination of different types of
motor (e.g., an internal combustion engine and an electric motor).
The prime mover 315 is in a driving relationship with the track
system 314. That is, the powertrain 312 transmits motive power from
the prime mover 315 to the track system 314 in order to drive
(i.e., impart motion to) the track system 314.
[0103] The seat 318 accommodates the user of the snow bike 310. In
this case, the seat 318 is a straddle seat and the snow bike 310 is
usable by a single person such that the seat 318 accommodates only
that person driving the snow bike 310. In other cases, the seat 318
may be another type of seat, and/or the snow bike 310 may be usable
by two individuals, namely one person driving the snow bike 310 and
a passenger, such that the seat 318 may accommodate both of these
individuals (e.g., behind one another).
[0104] The user interface 320 allows the user to interact with the
snow bike 310 to control the snow bike 310. More particularly, in
this embodiment, the user interface 320 comprises an accelerator, a
brake control, and a steering device comprising handlebars 322 that
are operated by the user to control motion of the snow bike 510 on
the ground. The user interface 320 also comprises an instrument
panel (e.g., a dashboard) which provides indicators (e.g., a
speedometer indicator, a tachometer indicator, etc.) to convey
information to the user.
[0105] The ski system 317 is disposed in a front 324 of the snow
bike 310 to engage the ground and is turnable to steer the snow
bike 310. To that end, the ski system 14 is turnable about a
steering axis of the snow bike 310. The ski system 317 comprises a
ski 328 to slide on the snow and a ski mount 330 that connects the
ski 328 to a front steerable member 332 of the snow bike 310. In
this embodiment where the snow bike 310 is a motorcycle and the ski
system 317 replaces the front wheel 302 of the motorcycle, the
front steerable member 332 comprises a front fork 334 of the snow
bike 310 that would otherwise carry the front wheel 302.
[0106] The ski 328 is a sole ski of the snow bike 310. That is, the
snow bike 310 has no other ski. Notably, the ski 328 is disposed in
a center of the snow bike 310 in a widthwise direction of the snow
bike 310. In this embodiment in which the snow bike 310 is a
motocycle and the ski system 317 replaces the front wheel 302 of
the motorcycle, the ski 328 contacts the ground where the front
wheel 302 would contact the ground.
[0107] Any feature described herein with respect to the track
system 14 of the snowmobile 10, including its track 21, may be
applied to the track system 314 of the snow bike 310, including its
track 321.
[0108] As another example, in some embodiments, as shown in FIGS.
15 to 18, an ATV 210 comprises a set of track systems
214.sub.1-214.sub.4 providing traction to the ATV on the ground,
where each of the track systems 214.sub.1-214.sub.4 comprises a
track 221 that may be constructed according to principle discussed
herein in respect of the track 21.
[0109] The ATV 210 comprises a prime mover 212 in a driving
relationship with the track systems 214.sub.1-214.sub.4 via the
ATV's powertrain, a seat 218, and a user interface 220, which
enable a user of the ATV 210 to ride the ATV 210 on the ground. In
this case, the seat 218 is a straddle seat and the ATV 210 is
usable by a single person such that the seat 218 accommodates only
that person driving the ATV 210. In other cases, the seat 218 may
be another type of seat, and/or the ATV 210 may be usable by two
individuals, namely one person driving the ATV 210 and a passenger,
such that the seat 218 may accommodate both of these individuals
(e.g., behind one another or side-by-side) or the ATV 210 may
comprise an additional seat for the passenger. For example, in
other embodiments, the ATV 210 may be a side-by-side ATV, sometimes
referred to as a "utility terrain vehicle" or "UTV". The user
interface 220 comprises a steering device operated by the user to
control motion of the ATV 210 on the ground. In this case, the
steering device comprises handlebars. In other cases, the steering
device may comprise a steering wheel or other type of steering
element. Each of the front track systems 214.sub.1, 214.sub.2 is
pivotable about a steering axis of the ATV 210 in response to input
of the user at the handlebars in order to steer the ATV 210 on the
ground.
[0110] In this embodiment, each track system 214.sub.i is mounted
in place of a ground-engaging wheel 213.sub.i that may otherwise be
mounted to the ATV 210 to propel the ATV 210 on the ground. That
is, the ATV 210 may be propelled on the ground by four
ground-engaging wheels 213.sub.1-213.sub.4 with tires instead of
the track systems 214.sub.1-214.sub.4. Basically, in this
embodiment, the track systems 214.sub.1-214.sub.4 may be used to
convert the ATV 210 from a wheeled vehicle into a tracked vehicle,
thereby enhancing its traction and floatation on the ground.
[0111] Any feature described herein with respect to the track
system 14 of the snowmobile 10, including its track 21, may be
applied to a track system 214.sub.i of the ATV 210, including its
track 221.
[0112] The snowmobile 10, the snow bike 310 and the ATV 210
considered above are examples of tracked recreational vehicles.
While they can be used for recreational purposes, such tracked
recreational vehicles may also be used for utility purposes in some
cases.
[0113] In other embodiments, a track system constructed according
to principles discussed herein may be used as part of an
agricultural vehicle (e.g., a tractor, a harvester, etc.), as part
of a construction vehicle, forestry vehicle or other industrial
vehicle, or as part of a military vehicle.
[0114] Certain additional elements that may be needed for operation
of some embodiments have not been described or illustrated as they
are assumed to be within the purview of those of ordinary skill in
the art. Moreover, certain embodiments may be free of, may lack
and/or may function without any element that is not specifically
disclosed herein.
[0115] Any feature of any embodiment discussed herein may be
combined with any feature of any other embodiment discussed herein
in some examples of implementation.
[0116] In case of any discrepancy, inconsistency, or other
difference between terms used herein and terms used in any document
incorporated by reference herein, meanings of the terms used herein
are to prevail and be used.
[0117] Although various embodiments and examples have been
presented, this was for purposes of description, but should not be
limiting. Various modifications and enhancements will become
apparent to those of ordinary skill in the art.
* * * * *